Improvement in rotary blowers



THOMAS LEI-'FEL Rotary Blower.

Patented May14,1872.

'III

THOMAS LEFFEL, OF SFRINGFIELD, OHIO.

F IMPROVEMENTIN RoTARv BLowERs.

Specicationwforming part of Letters Patent No. 126,639, dated May 14, 1872.

SPECIFICATION.

I, THOMAS LEFFEL, of Springfie1d,n the county of Clark and State of Ohio, have invented a new and useful Improvement in Re tary Blowers, of which the following is a specication:

N atnre and Object of the Invention. My invention consists, rst, in the construction of a duplex blower-case of peculiar shape, so that the airpassage is formed eccentric to Description ofthe Accompanying Drawing.

Figure 1 is an elevation, in perspective, of the blower with one side oi' the case and fanwheel removed. Fig. 2 is a perspective view of the fan-wheel attached to the shaft. Fig. 3 is a plan view of the blower with one side of the case removed.

B is the rotary fan or winged wheel. It is constructed of a central plate or diaphragm, C, which is notched, or sections cut away from the periphery inward, so as to form a base for the attachment of the wings d d. These wings are curved and are placed eccentric to the shaft, so as to form a series of chutes, R R, upon each side of the diaphragm C, the whole being attached to the shaft by a suitable hub or head-plates and bolts.

The advantage of this form of construction is a saving of material by dispensing with one of the plates or diaphragms, as hitherto constructed; also to form suitable curves or spiral chutes in the wheel, and an easy mode of attachment to the shaft; and can be easily made of sheet metal, cast-iron, or wood; and a saving of joints, which, by the principle of con'- struction, arebut one-half of the ordinary number, while a double series of chutes is obtained for taking or sucking in the air from each side of the case. By making the diaphragm G extend to the shaft, any reverberation by the union of the two currents of air within the wheels circle is avoided. This is the preferable mode of construction.

A represents the case for the wheel B to rel volve in. It is made of duplicate parts, only one of which is shown. The case so made is united at the center by means of bolts passing` through the flanges a a, which form a part of the case A. The exterior of the case is similar in shape to an ordinary bellows. L is the outlet or mouth; E, the base. The center of pressure of the escaping currents and the center of the strain from the vibration of the revolvin g wheel B are on a vertical plane through the center ofthe case and at the center of the base E. Thus the vibration of the wheel is in a measure counterbalanced 'by the weight of the machine. This will be easily seen; for a line drawn from the center of the mouth L to the center of the base E cuts the axial plane, and would divide the machine into two equal parts as to pressure. The air-due is formed of two unequal reverse curves, the outer boundary of which ilue is the periphery of the case and the two curved plates g and e, which are placed as shown in Fig. 3, their inner ends joining in close proximity to the circle of the revolving wheel at the point g. Auxiliary plates e e e( are shown. These may or may not be used, as desired. The curve ofthe plate .g should conform to the curve of that part f the case opposite to which it is placed. The inner boundary for the flue is the wheel circle. D is 'a bridge-tree, bolted to each side of the case, -with bearings attached for the shaft to journal on. Gr is a circular opening in each h'alf vof the case A for the admission of the air which is exhausted from the chutes R of the Wheel as it is revolved. The air is driven in a circular direction, as indicated by the arrows, through the exit-passage L. Y

By this construction of the case, when made of cast metal, the parts can be made so as to have but one joint formed by the flanges a a., which should be sufficiently wide for the bolt holes, and to allow packing to be used between the iianges, and so as to form an airtight joint. By thus uniting the case it can be easily taken apart for repairs and adjusted, as desired.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, is-

2. In @combination with the above, I claim the fan-wheel B, composed of the curved Wings d d and diaphragm C, forming the double series 1. The duplex case, when composed of the of chutes R, all as herein set forth. parts A A, with their flanges a a, curved plates .g e, and base E, arranged to form an equilibrium of bala-nce as to pressure and weight,a1i as herein set forth.

THOMAS LEFFEL. "Witnesses:

A. P. LINN COCHRAN, FRANK G. MAT'rox. 

